| 摘要 |
DC motor with brushes, having a rotor (4) comprising an axle (1) and packets of soft-iron lamellas perpendicular to the axle (1) and constituting poles. Wire terminals of coils on the poles are attached to a collector. The rotor is within a cylindrical housing (2) with permanent magnets on its inner surface. These permanent magnets are arranged in at least two layers, where a first layer (5) of a single piece and a second layer (6) of several segments (7) extending parallel to the longitudinal direction of the axle (1) are arranged, and the length of the segments (7) are equal to that of the first layer (5) taken in the longitudinal direction of the axle (1), and the width of the segments (7) are of uniform 1/n share of the ring constituted by the segments (7), where n is identical to the number of poles if that number is even, or is greater by one than the number of poles if that number is odd, and the number of the segments (7) is two less than the number of poles in the case of ten or less poles, or four less than the number of poles in the case of more than ten poles, and the segments (7) are arranged in two groups in axial symmetry where the width of the first layer (5) is defined by the central angle alpha of the segments (7) attached to each other and to the first layer (5), and the first layer (5) is attached to the inner surface of the housing (2) by adhesive. |
